GB296413A - Improvements in and relating to illuminating systems for optical projection apparatus - Google Patents

Improvements in and relating to illuminating systems for optical projection apparatus

Info

Publication number
GB296413A
GB296413A GB25024/28A GB2502428A GB296413A GB 296413 A GB296413 A GB 296413A GB 25024/28 A GB25024/28 A GB 25024/28A GB 2502428 A GB2502428 A GB 2502428A GB 296413 A GB296413 A GB 296413A
Authority
GB
United Kingdom
Prior art keywords
lens
produces
diverging
aperture
projection apparatus
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB25024/28A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of GB296413A publication Critical patent/GB296413A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B21/00—Projectors or projection-type viewers; Accessories therefor
    • G03B21/14—Details
    • G03B21/20—Lamp housings
    • G03B21/208—Homogenising, shaping of the illumination light

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Non-Portable Lighting Devices Or Systems Thereof (AREA)
  • Illuminated Signs And Luminous Advertising (AREA)
  • Projection Apparatus (AREA)

Abstract

296,413. Couade, M. Aug. 31, 1927, [Convention date]. Optical-projection apparatus. - In projectors wherein a reflector 2 behind the source of light 1 produces, with or without a condensing lens system 6, a beam having a large angle of convergence, and a diverging lens system is provided to convert the beam into one having a small angle of convergence, the diverging system comprises three separated lenses 8 - - 10, the lens 8 being divergent, and the lens 10 being placed against the projection aperture 3. The lens 8 produces an image 11 of the light source at or near the lens 9, and the lens 9 produces an image of the lens 8 near the lens 10. An aperture plate may be provided near the lens 8 and two images may be simultaneously projected, one in the plane of this aperture plate and the other at the aperture 3. The light source may ccnsist of a pastil of rare earth heated by an oxyacetylene &c. blowpipe in the optical axis and passing through the reflector, a sheet of mica &c. being placed between the source of light and the lens system to protect the lens system from the flame. Constructions wherein the diverging system comprises a single negative lens are described in the Specification.
GB25024/28A 1927-08-31 1928-08-31 Improvements in and relating to illuminating systems for optical projection apparatus Expired GB296413A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR296413X 1927-08-31

Publications (1)

Publication Number Publication Date
GB296413A true GB296413A (en) 1929-07-04

Family

ID=8888171

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25024/28A Expired GB296413A (en) 1927-08-31 1928-08-31 Improvements in and relating to illuminating systems for optical projection apparatus

Country Status (1)

Country Link
GB (1) GB296413A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5046838A (en) * 1989-03-17 1991-09-10 Minolta Camera Kabushiki Kaisha Illumination system for use in image projection apparatus
US5187509A (en) * 1990-03-07 1993-02-16 Minolta Camera Kabushiki Kaisha Illumination system for use in image projection apparatus

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5046838A (en) * 1989-03-17 1991-09-10 Minolta Camera Kabushiki Kaisha Illumination system for use in image projection apparatus
US5187509A (en) * 1990-03-07 1993-02-16 Minolta Camera Kabushiki Kaisha Illumination system for use in image projection apparatus

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